JPH0440904Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is applicable to pipelines mainly buried underground, such as gas pipes, water pipes, power lines, communication lines, etc. This invention relates to the structure of a lining material for lining for the purpose of repair or reinforcement.

The method of lining a pipe as described above is to apply adhesive to the inner surface of a cylindrical lining material, insert it into the pipe while turning it over using fluid pressure, and then apply the pressure fluid to the turned lining material. A method of bonding a lining material to a pipe by curing the adhesive while inflating it and pressing it onto the inner surface of the pipe is widely known and practiced.

The lining material used in this method is not only airtight in itself, but also hardens with adhesive when attached to the inner surface of the pipe to form a rigid pipe. It is also required that the tube formed inside the tube be able to retain the fluid inside without being destroyed and ensure a fluid flow path. Therefore, the structure of the lining material is to form an airtight coating layer on the outer surface of a cylindrical fabric.The cylindrical fabric is impregnated with a large amount of adhesive, and when the adhesive hardens, It is desirable that the adhesive and lining material form a strong FRP.

Prior Art Various lining material structures have been proposed based on these requirements. As an example, in the 1980s,
The one described in Publication No. 32986 is known.
This fabric forms a cylindrical fabric with a patterned texture,
A coating layer of synthetic resin is formed on the outer surface of the cylindrical fabric, and since the patterned weave structure has macroscopically coarse weaves and is difficult to cause mesh misalignment, there is a large amount of woven material between the weaves. It can be impregnated with an adhesive, and when the adhesive hardens, it takes on an FRP structure with a cylindrical fabric embedded inside.

Problems that the invention aims to solve However, in the lining material of the above structure,
The mosaori structure is a structure in which the threads gather in the weaves and spaces are formed between the weaves, so if the spaces become large, the adhesive will flow away from there, but instead the adhesive will be retained. There are some things I can't do.

In addition, when the adhesive is held in the space and the adhesive is turned over and pressed against the inner surface of the pipe, the adhesive is squeezed out of the space, and if the pipe has a branch, the branch pipe It often flows towards the In pipes with branches, it is necessary to drill holes in the lining material at the branch after lining.
If adhesive flows into the branch pipe, drilling becomes difficult.

The present invention has been developed in view of the above circumstances, and has a structure in which a coating layer is formed on the outer surface of a cylindrical fabric with a patterned texture, and furthermore, the cylindrical fabric can reliably retain adhesive. It is an object of the present invention to provide a lining material that can be used as a lining material and that prevents adhesive from flowing into a branch pipe by being press-fitted to the inner surface of a pipe pipe.

Means to Solve the Problems Accordingly, the present invention uses crimped yarns made of synthetic fibers for both the warp and weft to weave a cylindrical fabric with a diameter smaller than the inner diameter of the pipe line to be lined with a patterned weave structure, It is characterized in that an airtight coating layer is formed on the outer surface of the cylindrical fabric.

FIG. 1 shows the lining material of the present invention, in which 1 is a cylindrical fabric, and 2 is an airtight coating layer formed on the outer surface of the cylindrical fabric 1. FIG.

As shown in FIG. 2, the tubular fabric 1 is made by weaving warp threads 3 and weft threads 4 in a patterned gauze structure. That is, each of the warp threads 3 and the weft threads 4 is woven as a group of three threads. Therefore, at the intersection of each warp thread group 5 and weft thread group 6, for example, at the intersection a, the central weft thread 4b constituting the innermost weft thread group 6 is located, and the warp thread group is located on the outside thereof. The warp threads 3a and 3c on both sides of the thread group 5 intersect with each other, and the weft threads 4a and 4 on both sides of the weft thread group 6 intersect with each other.
c intersect, and the central warp yarn 3b constituting the warp group 5 is arranged at the outermost side. At the intersection b adjacent to the intersection b, the inner and outer sides of the intersection a are reversed.

In this structure, warp yarn group 5 and weft yarn group 6
Since the individual warp threads 3 and weft threads 4 are not organized inside the intersections a and b with
and weft yarn groups 6. Furthermore, since all the warp yarns 3 and weft yarns 4 are woven between the intersections a and b, the intervals between the yarns tend to be wide. Therefore, in this patterned gauze structure, the threads are close to each other inside the warp thread groups 5 and weft thread groups 6, and the threads open between the warp thread groups 5 and between the weft thread groups 6 to form spaces, as if they were intertwined with gauze, etc. The resulting structure has a texture similar to that of a tissue and has irregularities.

In the present invention, the warp yarns 3 and weft yarns 4 constituting the cylindrical fabric 1 are woven using crimped yarns made of synthetic fibers, and the diameter is smaller than the inner diameter of the pipe line to be lined under no load. It is woven to have a small diameter.

A coating layer 2 is formed on the outer surface of this cylindrical fabric 1. This coating layer 2 is an airtight coating made of rubber or soft plastic, and is firmly adhered to the outer surface of the cylindrical fabric 1. Therefore, when forming the coating layer 2 on the outer surface of the cylindrical fabric 1,
It is preferable to form the cylindrical fabric 1 under almost no load, but due to the tension applied when forming the film layer 2 on the surface of the cylindrical fabric 1, the warp yarns 3 may be slightly elongated by uncurling. There is no problem as long as the weave has a slightly elongated rectangular shape in the length direction of the tubular fabric 1.

To form the coating layer 2 in such a state, the cylindrical fabric 1 is passed through the head of an extrusion molding machine in a cylindrical shape, and the coating layer 2 is extruded into a tube shape on the outer surface of the fabric. This can be achieved by bringing it into close contact with the surface of the fabric 1. According to this method, almost no force is applied to the cylindrical fabric 1, so it does not stretch.

Effect In the present invention, when the adhesive is applied to the inner surface of the lining material, since the cylindrical fabric 1 is woven with a patterned texture, a large amount of adhesive can be contained in the spaces between the weaves. In addition, since the warp yarns 3 and the weft yarns 4 are crimped yarns, the yarns themselves can contain an adhesive. Because it is small,
The adhesive contained in the spaces between the weaves does not flow away and can be held securely. Then, when this lining material is turned over and crimped onto the inner surface of the pipe, since the lining material is formed to have a slightly smaller diameter than the inner diameter of the pipe, the lining material is stretched slightly in the circumferential direction and is crimped onto the inner surface of the pipe. At the same time, it is stretched slightly in the length direction due to fluid pressure. Therefore, the weave of the tubular fabric 1 is enlarged, and the area of the void becomes larger. Therefore, even if adhesive is extruded from the void by pressing the lining material against the pipe, the extruded adhesive is used to fill the expanded void, and no surplus adhesive is generated. A large amount of adhesive will not flow into the branch pipe.

Effects of the invention Therefore, according to the invention, a large amount of adhesive can be contained in the cylindrical fabric 1, and the adhesive will not flow away carelessly, and when lined in a pipe, the adhesive will be It will not flow into the branch pipe and make it difficult to perforate the branch pipe.

In addition, since the tubular fabric 1 is woven with a patterned weave structure, the weave is stable and does not easily cause misalignment, and since the weave is coarse, the number of threads can be small, and it can contain a large amount of adhesive. is possible. Furthermore, since the cylindrical fabric 1 is woven with crimped yarn, the lining material can easily extend in the length direction and circumferential direction, and can be easily inserted into the pipe. It easily fits on the inner surface of the pipe even if there is a problem.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the lining material of the present invention,
FIG. 2 is an enlarged internal view of a portion of the lining material of the present invention. 1...Tubular fabric, 2...Coating layer, 3...Warp yarn, 4...Weft yarn.

Claims (1)

[Scope of utility model registration request] A cylindrical fabric 1 having a diameter slightly smaller than the inner diameter of the pipe line to be lined is woven with a patterned weave structure using crimped yarns of synthetic fibers for both the warp 3 and the weft 4, and the outer surface of the cylindrical fabric 1 is airtight. A lining material for a conduit, characterized in that a coating layer 2 is formed thereon.